The works of the highly experienced and famous chymist, John Rudolph Glauber

by Johann Rudolf Glauber

If I add to burn iron or crocus martis the glass of lead, then the glass made by melting will have the yellow colour of a Hyacinth. The same crocus martis being molten with common glass, made of wood-ashes and salt; yields a greenish coloured glass which is the natural and proper colour of the iron. For the lead altered the colour of the former mentioned glass of the iron and made it yellow in the melting, and so hindred it from manifesting its true and natural colour. The glasses of two several colours being molten together do exhibit false colours, as may be seen by co-melting a skie colour and a yellow glass, the which being molten together yield a green colour, and doth so represent it self both in the fire and out of it too. From hence took I occasion to write and teach the way of finding out (by molten glasses) what kind of metal is hidden in any mineral or metallick earth. Which way of proving mines or minerals is far better and speedier than that which is usually done by a decoction and exhalation of lead in the Cupel. Thus may you mix five, six, eight or ten grains of some finely powdered mineral, with one or two lots of Venice glass being of easie fusion, and put the matter thus mixed in a well covered crucible, and by melting it reduce it into glass. The colour which will be in the said glass, will shew what metal the minera contained: Lead will yield a duskish colour, tin, a white, copper, a Sea-green; iron a somewhat greenish, silver a yellow, and gold a skie coloured: each of which colours is the true and internal colour of the respective metal. Gold doth also resemble a Ruby as to colour if other colours be added thereunto. But yet in the mean time, the skie-colour is its proper and natural colour, and so is yellow of silver: and this is notably agreeable with the truth, though to such as are ignorant, it seems a thing wonderfull, for indeed such mens knowledge ends in external things, but they are wholly ignorant of internal ones. But now the colours of gold and silver are better and more perfectly known, if there be added unto them some fix and white sulphur, which prevents the gold and silver from being thoroughly reduced into their peculiar bodies by fusion. If the Calx of gold or silver be molten with Borax, they both return into their former bodies, and do not pass into glass any ways coloured: But that some glass of easie fusion be mixed with those Calx’s, together with a little powder of flints and so molten, then the flints will (by reason of their sulphur) hold with themselves the gold and silver and so keep them that they admit not of fusion [or reduction] in their whole body, but do remain in the glass with some part of the metalline property which renders their internal colours visible, which else would not appear to sight.

N. B. If you have the minera’s of gold and silver at hand and melt them with glass, their colours will also appear, because that in the minera’s there always is some sulphur that hinders the metal from wholly returning into a body, so that some part of it abides in the glass and therein shews its colour. This also is to be minded, that if haply some minera or metallick earth contains not one metal barely, but 2 or 3 more metals, then always that metal of which the most quantity is in the said minera doth after fusing shine in the glass beyond the rest. As for example.

Suppose I would make tryal in the red Granates [stones] I powder some eight or ten gr. and mix them with one lot of white Venice glass finely powdered, and I melt them, and so turn them into glass. Now in this transmutation the glass doth not become red, but of a delicate grass colour, and so teacheth me what metals are hidden in those Granates, viz. copper and iron, and also more of this, [viz. the iron] than of the other. And though there should be some gold too, yet is it unperceiveable because of the predominancy of the iron over the copper and over the gold: For (in this operation) that metal onely manifests it self to sight, which is in greater plenty therein than the rest be.

Isaac Holland would by this vitrification signifie unto us, that after this life, viz. when the world is consumed with fire, there shall arise from the bodies of men reduced into ashes other clarified bodies, and of such and such colours, according as their souls have (either good or bad) framed, or as it were made unto themselves in this life-time in their gross bodies. What other thing [I pray] are fair colours, but the virtues of those subjects out of which they emit or send forth their splendour.

Take a similitude hereof from the melting of minerals, wherein though a mineral of silver or copper hath in it much silver or gold, yet if the superfluous sulphur be not (before the melting the said mineral) separated by a little as ’twere roasting fire; but be (together with that gross sulphur,) set in a vehement melting fire, there will not verily be any metal gotten hencefrom, but that stinking sulphur would transmute the good metal into black Scoria’s. So likewise, no fair and transparent glass can be (by melting) made out of pure metals, if that kind of gross sulphur should adhere unto them.

These few things touching clarified bodies, I could not pass over in silence, and much less could I omit this, viz. that the bodies of all things may be much better transmuted into clarified bodies by our secret fire, than by the common fire. For the common fire drives away the volatile parts, whereas on the contrary, our fire doth preserve them and renders them fixt and transparent as well as the other parts. And therefore of necessity these bodies must needs shine with fairer and brighter colours than those others, in which the common fire hath expelled the mercury and sulphur, and left remaining nothing else but the salt.

But now as concerning such a transmutation into ashes by our moist and secret fires, any one may easily guess the way. For whatsoever is put in them must be necessarily burned into ashes, and they far better ashes too than are made by burning in the common fire. For if the common fire burns any herb or wood into ashes, the sulphur burns away in a flame, the mercury betakes it self to its wings and away flies it, and the salt abides behind in a few ashes or a little earth. Now our Philosophical calcination takes away nothing but conserves all [the princip’es so called] together; and doth in the first place produce to view a black coal, then afterwards other various curious colours, and then a white colour, and at last to compleat the operation, it yields a red fusile and medicinal stone.

N. B. Here it is to be noted that for preparing a pure medicine, a pure subject is to be made use of; for if so be that any one would endeavour the transmutation of an herb, wood, or any animal into a medicament by the help of the secret fires, then all the ashes and feces which were in the herb would also adhere unto the medicament and would render it impure, therefore necessity requires that you do not take the whole herb, or the whole animal, but onely their essential salt, the which being void of feces consists onely of the pure principles of the herb; and doth easily admit of being transmuted into a red tinging, and more soluble stone than the herb it self with its feces by it, doth.

I would not have you to account of these things here delivered you as if they were of small moment. No, for they are such things as cover over with this their vile or base covering, such matters as are of great weight, and which will not come to every bodies knowledge. Surely ’tis a considerable thing that a part of any vegetable, animal or mineral body should (by conserving all the most volatile parts, and by rendring them altogether constant and stable, without the least loss of weight) be ripened into a fixt soluble and tinging red, and medicinal stone. This way of transmuting all things without loss of the weight thereof into clarified bodies, is of all others the best. And those bodies on this wise clarified are without doubt of greater efficacy than are the gross bodies themselves of the animals, vegetables, and minerals, which do as yet abound with their gross and impure feces.

But if so be any one be not herewithall content but panteth after higher things, he may advise with himself about extracting the soul out of this red and fixed stone, and reduce it again by a reiterated operation unto the form of a stone, whereby he will without doubt make it yet far more effectual. And by how much the oftner any one shall repeat this same operation, so much the more effectual a medicine will he obtain, for it will at every reiteration notably augment its virtues, for by such actions the efficacy and virtues of things are con-centrated and driven into a very little compass, wherewithall wonderfull things may be performed.